Justice League Heroes: The Flash Codes -

All heroes:
Hold and press , , , , , , , , at the title screen. The Flash will shout to confirm correct code entry.

Full lives:
Hold and press , , (x2), (x2), , , at the title screen. The Flash will shout to confirm correct code entry.

All powers:
Hold and press (x4), , , , , at the title screen. The Flash will shout to confirm correct code entry.

Larger opponents:
Hold and press (x2), (x2), , , , , at the title screen. The Flash will shout to confirm correct code entry.

Smaller opponents:
Hold and press (x2), (x2), , , , , at the title screen. The Flash will shout to confirm correct code entry.

Larger Flash:
Hold and press , , , , , , , , at the title screen. The Flash will shout to confirm correct code entry.

Smaller Flash:
Hold and press (x3), , (x3), , at the title screen. The Flash will shout to confirm correct code entry.

Boss Rush mode:
Successfully complete the game.

Superman Race mode:
Successfully complete the game.

"Making of..." option:
Defeat Circe.

Theater option:
Defeat Gorilla Grodd.